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Only for training and service purposes
LGE Internal Use Only
Installation
6. CST Type Indoor Unit
• Drain piping must have down-slope (1/50 to 1/100):
be sure not to provide up-and-down slope to prevent
reversal flow.
• During drain piping connection, be careful not to
exert extra force on the drain port on the indoor
unit.
• The outside diameter of the drain connection on
the indoor unit is 32mm.
•
Be sure to install heat insulation on the drain piping.
Piping material: Polyvinyl chloride pipe VP-25
and pipe fittings
Heat insulation material: Polyethylene foam with
thickness more than 8 mm.
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump operation:
• Connect the main drain pipe to the exterior
and leave it provisionally until the test comes
to an end.
• Feed water to the flexible drain hose and
check the piping for leakage.
• Be sure to check the drain pump for normal
operating and noise when electrical wiring is
finished.
• When the test is completed, connect the flexi-
ble drain hose to the drain port on the indoor
unit.
Drain test